Chapter 7
What is Dalton's Law of partial pressures?
The total pressure exerted by a mixture of gases is the sum of the partial pressures of the individual gases present Ptotal=P1+P2+P3+....
What is the equation and units for osmolarity?
Osmolarity= molarity x i
Units: osmol
What type of reaction is this: 2CuO → 2Cu + O2
decomposition
Explain to me what the oxidizing agent is and whether it loses or gains electrons.
Oxidizing agent is the substance reduced, it gains electrons from the substance oxidized
Is acetone soluble in benzene, water, or both?
Both
What is the value of the constant R? (including units!)
R= 0.0821 L*atm/mol*K
Calculate the percent by mass concentration of a solution with 23.4g solute in 86.1g solution.
27.2%
What is the oxidation number of O2?
0
What is the intermolecular force that occurs between all molecules?
London forces
What type of reaction is this: C3H8 + 5O2 → 3CO2 + 4H2O
combustion
A balloon is filled with 35.0 L of helium in the morning when the temperature is 20.0 C. By noon the temperature has risen to 45.0 C. What is the new volume of the balloon?
38.0 L
Calculate the molarity of 20.0 g NaCl in 1.00 L of solution.
0.342 mol/L
Oxidation number of N in: NH2OH
-1
List the three changes of state that are exothermic
condensation, freezing, and deposition
Is SO3 + H2O → H2SO4 a redox reaction?
No, why?
A helium balloon with an internal pressure of 1.00 atm and a volume of 4.50 L at 20.0 C is released. What volume will the balloon occupy at an altitude where the pressure is 0.600 atm and the temperature is –20.0 C?
6.48 L
Calculate the volume percent of solute: 4.00 mL of bromine in enough carbon tetrachloride to give 87.0 mL of solution.
4.60%
Which substance is reduced in the following redox reaction? CO + H2O → CO2 + H2
H2O
In Boyle's law, what is the relationship between pressure and volume?
They are inversely related. If pressure increases, volume will decrease. If volume increases, pressure will decrease.
In an osmolarity problem, what is the value of i for glucose?
1
A balloon that can hold 85 L of air is inflated with 3.5 moles of gas at a pressure of 1.0 atmosphere. What is the temperature in 0C of the balloon?
23 0C
How many grams of Na2CO3 are needed to prepare 25.0 mL of a 2.00%(m/v) Na2CO3 solution?
0.500 g
What is the equilibrium expression for the equation SnO2(s) + 2CO(g) <==> Sn(s) + 2CO2(g)?
Keq= [CO2]2/[CO]2
Explain to me hypertonic, hypotonic, and isotonic by comparing concentrations of two solutions.
If one solution has a higher concentration than the other, it is hypertonic, if it has a lower concentration it is hypotonic, and if they are equal concentrations they are isotonic to each other.
For the reaction N2O4(g) <==> 2NO2(g), Keq = 0.2. At a particular time, the following concentrations are measured: [N2O4]=2.0 M, [NO2] = 0.2 M. Is this reaction at equilibrium? If not which direction will the reaction proceed?
Keq=[NO2]2/[N2O4] = (0.2)2/2.0 = 0.02 No, reaction will proceed right, because there is less product than Keq